McPherson Quality Painting and Water Proofing
PROBLEM
Surfactant
leaching causes blotchy, sometimes glossy, tan or brownish spots
to appear on the surface of latex paints.
Surfactants are necessary in making paint. They evaporate and are
not part of the paint film, their appearance does not harm it in
any way. In most cases, the leaching occurs slowly and is washed
away by weathering before even being noticed.
Possible causes:
· Painting in cool, humid conditions or just before it occurs,
such as late afternoon or just before or right after rain. The
longer drying times allows the paints water-soluble ingredients-which
would normally evaporate, or be leached out by rain or dew - to
rise to the surface before the paint thoroughly dries.
· Mist, dew or other moisture drying on the painted surface
shortly after it has dried.
SOLUTION
Prevention tips:
Do not paint if temperatures are below 50° or in the late
afternoons if cool, damp conditions are expected in the evening
or overnight.
If the surfactant leaching occurs in the first day or so after
the paint is applied, the blotches or stains can usually be
rinsed off with a strong stream of water from a garden hose. A
month or so of weathering will remove even the more stubborn
cases of leaching. Surfactant leaching should not affect the
ultimate durability of the coating.
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